Laura, are you sure your sister is on synthroid too? I don't mean to doubt you, but from what I could find on the internet, synthroid is for hypothyroidism. Maybe it depends on the severity of the condition? I'd prefer if my husband could take synthroid instead of the drug the doctor prescribed, which has scary side effects. If that drug doesn't work, they'll have to irradiate the thyroid, which kills it, then he'll have hypothyroidism and still have to take drugs the rest of his life. Sounds like a no win situation to me.
I'm a bit skeptical myself about all the drugs doctors prescribe, often because they treat symptoms rather than the source of the problem, but I won't go there...I'm not trying to start a debate. I just wish I could find an alternative solution for him that is less drastic, but my husband is also the type to do whatever the doctor says. He rolls his eyes at all my "healthy habits" and "natural remedies". If it were me, I'd be searching out all my options and be open to lifestyle and dietary changes, possible natural therapies etc. before killing my thyroid. But I'm a wacko.
Anyway, thanks for responding and for any more info you can give.
Melissa